Question

which of the following statements are correct? 1.the fragmentation is applicable for data in the datagram but not for header. 2.reassembly of the fragments must be performed at teh destination because,the intermediate network may have different maximumtransmission unit(MTU)sises. 3.in the ip header, the time-to live(TTL)field isinvariable.

Answer 1

Explanation:

Fragmentation is done by the network layer when the maximum size of datagram is greater than maximum size of data that can be held a frame i.e., its Maximum Transmission Unit (MTU). The network layer divides the datagram received from transport layer into fragments so that data flow is not disrupted.

Since there are 16 bits for total length in IP header so, maximum size of IP datagram = 216 – 1 = 65, 535 bytes.